Process of strengthening cotton, artificial silk, artificial foils of cellulose, viscose, or the like and material prepared by this process



Patented May 10, 1932 KII RT SPONSEL, IOF FRANK]?ORT-ON-THE-MAIN-HOCHST, AND KURT JOCHUM, F

rmnxronr-on-rma-mam, GERMANY, assrenons rnanxronr-ou-rnn-mam, GERMANY,

axrmnensnmscmr'r, or TION or ens-MANY,

TO "I. G. FARBEN'INDUSTRIE A CORPORA- PROCESS OF STRENGTHENING COTTON, ARTIFICIAL SILK, ARTIFICIAL FOILS OF CELLULOSE, VISCOSE, OR THE LIKE AND MATERIAL PREPARED BY THIS PROCESS No Drawing. Application filed August 2, 1929, Serial No. 383,152, and in Germany August 10, 1928.

, The present invention relates to threads, fabrics and sheets ofcellulose, such as, for example, cotton or artificial silk, containing glyoxal residues.

We have found that threads, fabrics and sheets of cellulose, such as, for example, cot: ton or artificial silk, containing glyoxal residues highly surpass the parent materials in regard to breaking strength, elongation and the manner in which the interstices are closed.

Such articles of manufacture can be prepared by treating hanks of cotton or artificial silk or sheets of viscose with glyoxal or an agent splitting off glyox'al, for instance, in a dilute aqueous solution, subsequentlysqueezing oil the excess and gently drying the material. The material can also be impregnated in vacuo. This aftertreatment' has the advantage over the known-treatment with formaldehyde that no pressure apparatus is re quired, that the temperature need not be raised and that the workmen are not injured by the odorless glyoxal.

The above-mentioned improvement in the properties of the said cellulose materials by the treatment with glyoxal or an agent splitting ofi glyoxal is due to a chemical reaction. During the im re ation, the glyoxal combines with the y roxy groups of the cellulose materials' thereby forming acetal-like products which have the desired properties.

The following examplesillustrate the invention, but are not intended to limit it there- (1) Viscose artificial silk, after being precipitated, is treated in a bath containing 2 g. of glyoxal, 3 g. of sodium dimethyl-aniline-psulfonate and 10. g. of glycerine per liter, freed from the excess of liquid by squeezing it through rubber rollers and dried. The strength of the product thus obtained has increased whereas the elongation of 7%" has remained unaltered.

-(2) Ammon'iacal'copper oxide silk is impregnated-with a solution of glyoxal of 2% strength at a temperature of 20 0., squeezed through rubber rollers and dried at a temperature ofbetween 50 C. and C. The 50 product thus obtained has, a breaking strength of 213 g., an elongation of 9.3%,

whereas the parent material has only a breaking strengthof 174 g. and an elongation of 6%. I

We claim:

1. As new articles of manufacture threads,

fabricsand sheets of cellulose containing glyoxal residues.

2. Artificial silk of viscose containing glyoxal residues.

3. Guprammonium silk containing glyoxal residues.

In testimony whereof, we aflix our signatures.

- KURT SPONSEL.

KURT JOCHUM. 

